Iviold



0; s. BRITTON. CARBON MOLD.

(No Model.)

Patented Jan. 2, 189.4.

INVENTOR. 6% A. MM

'kw lt -Marv.

WITNESSES.

UNTTED STATES EATENT Orricst CHARLES S. BRITTON, OF CLEVELAND, OHIO.

CARBON=MOLD.

SPECIFICATION forming part of Letters Patent No. 511,750, dated January 2, 1894.

Application filed October 18, 1892. Serial No. 449,221. (No model.)

To aZZ whom it may concern:

Be it known that 1, CHARLES S. BRITTON, a citizen of the United States, residing at Cleveland,in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Carbon-Molds and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention hereinafter described relates to a carbon mold especially adapted to be used in connection with an apparatus for'making electric light carbons, which is shown and described in an application for a patent filed concurrently with this application, Serial No. 449,222.

Electric light carbons are generally formed under great pressure between two plates having corresponding half round grooves in their meeting surfaces. To prevent the pressure from forcing the carbon material out of the ends of the grooves the plates are surrounded by a frame which fits against the ends of the grooves. After the carbons are formed they can be removed with less danger of damaging them, by removing the top plate and pushing the carbons lengthwise in their grooves until their ends project therefrom, when all are lifted and removed at one time by a board which is slipped under said projecting ends. To remove the carbons in this manner it is clear that the ends of the grooves must be freed from the frame, and this result is usually secured by making the frame so that it can be taken apart.

The object of my invention is to provide a mold having the necessary frame surrounding the mold plates, in which the ends of the grooves maybe freed without the entire separation of the bottom plate and the frame; and my invention consists in the construction and combination of parts hereinafter described and pointed out definitely in the claims.

In the drawings, Figure 1 is a perspective View of myimproved mold; and Fig. 2 is a transverse vertical sectional view of the same, and Fig. 3 is a perspective view of the top plate or upper removable portion of the mold.

Referring to the parts by letters, A repre= sents a metallic plate having a series of half round grooves in its uppersurface extending from one end to the other.

B represents a frame considerably higher than the thickness of the plate. The frame surrounds the plate and fits closely against its sides and ends. It fits closely against the ends to prevent the pressure from forcing the carbon materialout of the ends of the grooves; and against both the sides and ends to prevent the carbon material from falling between the plate and frame. The frame should fit around the plate as closely as possible while at the same time permitting the relative movement of plate and frame.

Projecting from the lower edge of the side of the plateAis a flange awhich lies beneath a shoulder 11 forming the top wall of a recess in the lower edges of the sides. When the bottom of the plate and the bottom of the frame lie in the same horizontal plane, thetop of the plate is below the top of the sides as shown; but when the plate is moved up in the frame, the flange a does not strike the shoulder 1) until the top of the plate is above the top of the frame. Therefore by moving the plate up as described, the carbons which have been formed in the grooves may be pushed lengthwise and then removed in the ordinary way. Moreover when the mold is turned upside down, as it will be when used in the ap paratus described in the other application hereinbofore named, the flange a prevents the plate from falling out.

D represents a plate having in its lower face grooves which correspond with the grooves in the plate A. It is of such size that it fits snugly within the frame B. The grooves in it are so placed that they form,with the grooves in the plate A, cylindrical molds in which the carbon pencils are formed.

In using the described mold, the plate D is removed, and measured quantity of the plastic carbon material is placed on the plate A within the frame B. The plate D is then 5 placed within the frame above the plate A and sufficient pressure applied to the plates A and D to compress the carbon material and form the cylindrical pencils in the grooves in said two plates.

Having thus described my invention, I claim- IOO In a carbon mold, a plate A having a flange of, substantially as and for the purpose set 1 projecting from its sides, combined with a forth. 10 Y frame B closelysurrounding said plate, hav- In testimony whereof I affix my signature in ing a recess in the lower part of the sides in presence of two witnesses.

5 which said flange lies and has a limited ver- CHARLES S. BRITTON.

tical movement, said framelying close against Vitnesses: the sides of the plate, and a plate D adapted E. L. THURSTON, to enter said frame from the upper side there- FRANCIS J. ING. 

